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• W2508367506 abstract "Abstract Forty-five experimental flames established over a flat plate were analyzed. A diffusion flame generated from a porous ethylene burner discharging into a parallel oxidizer flow provided a laminar boundary layer. All experiments were conducted in parabolic flights that provide twenty-two seconds of microgravity conditions. Soot production was tracked using the laser-induced incandescence technique, while the spontaneous emission of OH* was used in order to identify the reaction zone. The study was focused on the influence of the oxygen index, the oxidizer flow velocity, and the fuel injection velocity on the flame geometry, characterized by the stand-off distance, flame length and the soot production. A dimensionless procedure of transport equations and a scaling analysis were carried out in order to interpret the experimental results and to understand the flame extinction process at the trailing edge. The stand-off distance is found to exhibit three regimes as the distance from the burner leading edge increases: a convection-controlled regime close to the burner leading edge, followed by a diffusion-controlled regime and then a third regime at the burner trailing edge due to the appearance of tridimensional effects. Experimental results shows that the flame length decrease with the oxygen index and increases with the fuel injection velocity and the oxidizer velocity. This latter evolution is opposite to that observed in ‘closed-tip’ diffusion flame, showing that the flame length is controlled by radiant quenching at the flame trailing edge. Concerning soot production, it is observed that the characteristic length scale of soot volume fraction evolves in an opposite manner with the flame length, showing that this latter is not relevant to define the soot residence time. A residence time based on the integrated soot volume fraction and on the oxidizer flow was found appropriate to study soot formation processes." @default.
• W2508367506 created "2016-09-16" @default.
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• W2508367506 date "2017-01-01" @default.
• W2508367506 modified "2023-09-25" @default.
• W2508367506 title "Oxygen index effect on the structure of a laminar boundary layer diffusion flame in a reduced gravity environment" @default.
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• W2508367506 doi "https://doi.org/10.1016/j.proci.2016.06.065" @default.
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